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* Allow certain operations to succeed even if we don't have write

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permission to the Nix store or database.  E.g., `nix-env -qa' will
  work, but `nix-env -qas' won't (the latter needs DB access).  The
  option `--readonly-mode' forces this mode; otherwise, it's only
  activated when the database cannot be opened.
This commit is contained in:
Eelco Dolstra 2004-10-25 14:38:23 +00:00
parent 3ade3e7721
commit f4d44a0026
9 changed files with 58 additions and 16 deletions
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13
src/libstore/db.cc
View file

@ -1,6 +1,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <memory>
@ -81,12 +82,16 @@ void Transaction::moveTo(Transaction & t)
void Database::requireEnv()
{
checkInterrupt();
if (!env) throw Error("database environment not open");
if (!env)throw Error("database environment is not open "
"(maybe you don't have sufficient permission?)");
}
Db * Database::getDb(TableId table)
{
if (table == 0)
throw Error("database table is not open "
"(maybe you don't have sufficient permission?)");
map<TableId, Db *>::iterator i = tables.find(table);
if (i == tables.end())
throw Error("unknown table id");
@ -210,7 +215,11 @@ void Database::open(const string & path)
string accessorsPath = path + "/accessor_count";
fdAccessors = ::open(accessorsPath.c_str(), O_RDWR | O_CREAT, 0666);
if (fdAccessors == -1)
throw SysError(format("opening file `%1%'") % accessorsPath);
if (errno == EACCES)
throw DbNoPermission(
format("permission denied to database in `%1%'") % accessorsPath);
else
throw SysError(format("opening file `%1%'") % accessorsPath);
/* Open the lock file. */
string lockPath = path + "/access_lock";